Capsicum

Blinky

esp32c3 blink led blinky serial medium

Blink the LED

Details

Flash in this simplest blinky code to test the PCB.

Troubleshooting: Cannot view serial prints

On Arduino IDE, enable the option Tools > USB CDC on Boot > Enabled

or on arduino-cli, add the FQBN option as --fqbn esp32:esp32:esp32c3:CDCOnBoot=cdc

Measure power consumption

Connect the test points GND and VBAT to nRF Power Profiler kit to measure the power consumption. DO NOT insert the battery in the PCB to ensure the power is only supplied from the nRF Power Profiler kit.

The power consumption of the PCB is around 20.9mA when the LED is on and 20.15mA when the LED is off.

Serial console

Serial output from the firmware.

Schematic

Wire up the hardware accordingly

Code

Download code

#define LED 3

void setup() {
  pinMode(LED, OUTPUT);
  digitalWrite(LED, LOW);

  Serial.begin(115200);
  Serial.println("Start blinky");
}

void loop() {
  ledON();
  delay(200);

  ledOFF();
  delay(200);
}

void ledON() {
  Serial.println("LED ON");
  digitalWrite(LED, LOW);
}

void ledOFF() {
  Serial.println("LED OFF");
  digitalWrite(LED, HIGH);
}

Makefile

BOARD?=esp32:esp32:esp32c3:CDCOnBoot=cdc
PORT?=/dev/cu.usbmodem1410*
BUILD=build

.PHONY: default lint compile flash clean

default: lint compile flash clean

lint:
	cpplint --extensions=ino --filter=-legal/copyright,-runtime/int *.ino

compile: clean lint
	arduino-cli compile --fqbn $(BOARD) --output-dir $(BUILD) ./

flash:
	arduino-cli upload --fqbn $(BOARD) --port $(PORT) --input-dir $(BUILD)

clean:
	rm -rf build